The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 27, 1992
Filed:
Sep. 14, 1990
Applicant:
Inventors:
Masao Takashige, Himeji, JP;
Takeo Hayashi, Himeji, JP;
Katsumi Utsuki, Himeji, JP;
Masahiro Fujimoto, Himeji, JP;
Assignee:
Idemitsu Petrochemical Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ;
U.S. Cl.
CPC ...
15624411 ; 15624413 ; 15624414 ; 15624418 ; 15624419 ; 15624423 ; 15624424 ; 156250 ; 156256 ; 156500 ; 156510 ; 156512 ; 2642091 ; 2642095 ; 2642105 ; 2642107 ; 425113 ; 4251331 ;
Abstract
A method of and an apparatus for biaxially orienting a crystalline thermoplastic resin film and subsequently thermally processing the film with first and second heating devices, in which the temperatures of respective heaters for biaxially orienting the film are separately controlled, the first heating device being operated by a tubular method or a tenter method, and the second heating device being operated under a tenter method and above the temperature in the first heating device, whereby a melting and sticking of the film is prevented and the bowing ratio is decreased.